I suspect that the references cited in the first post refer to automobiles, not motorcycles.
It's beyond my comprehension why there would be any debate at all about the use of the headlight at all times on a motorcycle. Here in North America, it has been standard practice (required by law) for at least the last 20 years that motorcycle headlights are on at all times. Heck, we don't even get an on-off switch for exterior lighting on a motorcycle manufactured for sale in North America... all the external lights are on, at full brightness, whenever the ignition is on.
We get a single switch to switch between high and low beam, that is all.
Michael
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